资 源 简 介
The MAX8834Y/MAX8834Z flash drivers integrate a1.5A PWM DC-DC step-up converter and three programmablelow-side, low-dropout LED current regulators.The step-up converter features an internalswitching MOSFET and synchronous recTIfier toimprove efficiency and minimize external componentcount. An I2C interface provides flexible control of stepupconverter output voltage setTIng, movie/flash modeselecTIon, flash TImer duration settings, and current regulatorsettings. The MAX8834Y/MAX8834Z operatedown to 2.5V, making them future proof for new batterytechnologies.The MAX8834Y/MAX8834Z consist of two current regulatorsfor the flash/movie mode. Each current regulator cansink 750mA in flash mode and 125mA in movie mode.The MAX8834Y/MAX8834Z also integrate a 16mA lowcurrentregulator that can be used to indicate camerastatus. The indicator current regulator includes programmableramp and blink timer settings. A programmableinput current limit, invoked using the GSMB control,reduces the total current drawn from the battery duringPA transmit events. This ensures the flash current is setto the maximum possible for any given operating condition.Additionally, the MAX8834Y/MAX8834Z include aMAXFLASH* function that adaptively reduces flash currentduring low battery conditions to help prevent systemundervoltage lockup.
